CN206116301U - Zero disconnected novel intelligent moulded case circuit breaker who lacks looks protect function in area - Google Patents

Abstract

The utility model discloses a novel intelligent molded case circuit breaker with the function of zero-off, zero-phase and lack-of-phase protection, which comprises a switch base and a switch cover. Voltage area, zero-sequence current transformer and current signal acquisition installation area of current transformer, weak voltage installation area of voltage signal acquisition, the contact system, arc extinguishing system, terminal block and switch mechanism are installed in the strong voltage area and the three-phase main circuit current transformer and zero-sequence current transformer connected on the main circuit; the controller mounting seat is arranged above the current signal acquisition installation area and the weak current installation area, and the weak current control part of the utility model and the disconnector The buckle is installed on the controller installation seat, which is located directly above the current signal acquisition installation area and the voltage signal acquisition weak voltage installation area, completely separated from the strong current part, and has no influence on each other. Higher measurement accuracy and better safety performance.

Description

A new type of intelligent plastic case circuit breaker with the function of zero-break and open-phase protection

technical field

The utility model relates to a circuit breaker, in particular to a novel intelligent molded case circuit breaker with the function of zero-break and phase-open protection.

Background technique

As we all know, any molded case circuit breaker has an insulated plastic case. This insulating case contains the contact system of the circuit breaker, the operating mechanism connected to it, the control unit for overcurrent protection, etc., and other releases and indications as accessories. Auxiliary contacts, alarm contacts, etc. are installed and contained inside, so that the circuit breaker forms a complete whole. The electrical control part of some intelligent molded case circuit breakers is installed inside the plastic casing, as shown in the Chinese invention patent No. 201110282525.5. The voltage transformer, two main and auxiliary processors, and the display circuit board) are all installed on the back of the switch cover. During assembly, the parts need to be installed on the back of the switch cover, and then the switch cover is installed on the base, which cannot realize the product The functions are modularized, the structure is more complicated, and the installation and debugging are more inconvenient. Moreover, the above-mentioned circuit breaker does not have the function of zero-off and phase-opening protection, the high-voltage and low-voltage systems are not isolated, and the safety performance is not high, which fails to meet the needs of technology and the market.

At the same time, when a zero-breaking fault occurs, the following hazards will be caused:

1. The load of single-phase power supply is burnt out;

2. The three-phase asymmetry is exacerbated, and the midpoint displacement is serious. In the TN system without equipotential bonding, this voltage may cause electric shock accidents.

3. In the zero-off fault of electrical equipment, the load is burned out in a "thermal delay", making the zero-off fault concealed and destructive.

When a phase failure occurs, it will cause the following hazards:

1. The three-phase voltage is unbalanced, and the midpoint displacement may exceed the safe voltage of 50V. In the TN system without equipotential bonding, this voltage may cause electric shock accidents.

2. For the three-phase AC asynchronous motor, because the unbalanced voltage cannot generate a perfect circular rotating magnetic field, the dynamic torque decreases and the speed decreases until it is blocked and burned.

3. For single-phase loads, it cannot work normally due to the decrease of phase voltage. For single-phase motors, due to the decrease of phase voltage, the electromotive torque decreases, and the speed decreases until it is blocked and burned.

It can be seen from this that the importance of increasing the protection function of zero-break and open-phase, the inventors focus on adding the intelligent zero-break and open-phase protection function to the circuit breaker without increasing the volume of the traditional circuit breaker, so as to realize intelligent, Smart molded case circuit breaker with modular functions.

Contents of the invention

In order to overcome the deficiencies of the prior art, the utility model provides a new type of intelligent molded case circuit breaker with a reasonable structure (modularization and building blocks), extremely convenient installation and debugging, and the protection function of zero-phase failure.

The technical scheme that the utility model solves its technical problem adopts is:

A new type of intelligent molded case circuit breaker with the function of zero-off and phase-open protection, including a switch base and a switch cover. Sequence current transformers and current signal collection installation areas of current transformers, and weak voltage installation areas for voltage signal collection. In the strong voltage area, contact systems, arc extinguishing systems, wiring terminals, switch mechanisms and connections in the main circuit are installed. The three-phase main circuit current transformer and zero-sequence current transformer on the top; the controller mounting seat is provided above the current signal acquisition installation area and the weak current installation area, and a modular intelligent control device is installed in the controller installation seat system and zero-off-phase-open protection circuit, the intelligent control system and zero-off-phase-open protection circuit include a signal acquisition circuit, a zero-off-phase-open analysis and comparison circuit for analyzing the signal of the signal acquisition circuit, and a zero-off-phase-open analysis and comparison circuit The display screen connected with the circuit, the trip driving circuit connected with the zero-phase-off analysis and comparison circuit, the fault alarm circuit connected with the zero-phase-off analysis and comparison circuit, and the communication circuit connected with the zero-phase-off analysis and comparison circuit, also includes A power supply circuit for supplying power to each of the above circuits, the signal acquisition circuit includes a voltage signal detection circuit for detecting the main circuit, a current transformer for detecting current signals, and a zero-sequence current transformer detection circuit, and the voltage signal detection circuit for the main circuit passes the voltage Transformer isolation acquisition processing, the power supply circuit includes its own power supply circuit and auxiliary power supply, the self-power supply power supply is obtained after being collected by the three-phase main circuit current transformer to a parallel voltage stabilizing circuit for processing, and the auxiliary power supply is connected to the main power supply through wires The circuit connection is obtained after the treatment of the transformer and three-phase rectification and voltage stabilization.

In the utility model, the signal acquisition circuit, zero-off phase-opening analysis and comparison circuit, display screen, tripping drive circuit, fault alarm circuit and communication circuit are all installed in the controller mounting seat through a circuit board.

In the utility model, a tripper for disconnecting the main circuit of the circuit breaker is installed at one corner of the controller mounting base, and the push rod of the tripper realizes tripping by pushing the drawbar on the switch mechanism, and the switch is then released. When buckling, the push rod on the switch mechanism is used to push the push rod of the release to realize energy storage; the release is connected to the trip drive circuit through wires.

In the utility model, the zero-off phase-opening analysis and comparison circuit includes a bit CPU processor, an A/D processing module, an output module, an input module and a fault information storage module.

In the utility model, the input module includes a setting data input circuit for setting system working parameters by keys and keys, and a date clock circuit for providing running time and time parameters of fault occurrence.

The beneficial effect of the utility model is that: the weak current control part and the release device of the utility model are installed on the controller installation seat, and the controller installation seat is located in the front of the current signal acquisition installation area and the weak voltage installation area of the voltage signal acquisition. Above, it is completely separated from the strong current part, there is no influence on each other, the measurement accuracy is higher, and the safety performance is better, and the entire controller mounting base and its internal circuits form a complete module, which can be used during debugging and maintenance. , you only need to take out the mounting base for processing without dismantling the entire circuit breaker, realizing the modularization of the product; furthermore, the release is also integrated on the controller mounting base instead of being installed independently in the circuit breaker. The installation method of the release is simplified, and the assembly efficiency is improved; further, the utility model can detect and display the operation status of each function of the load in real time through the display screen and other control circuits, and at the same time, the parameter values can be set as required. It is easy to debug and use, realizing the intelligence of the product, and the intelligent control system and the zero-off and open-phase protection circuit are completely set in the switch base and switch cover of the size of a traditional circuit breaker, without taking up additional space, and it is convenient to install the traditional circuit breaker Make an update.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is a structural schematic diagram of the present embodiment (only the housing part is drawn in this figure);

Fig. 2 is a structural schematic diagram when the switch cover is opened in Fig. 1;

Figure 3 is a schematic structural view of the mount;

Fig. 4 is the top view of Fig. 1;

FIG. 5 is a schematic structural diagram of the weak current control part of this embodiment.

detailed description

Referring to Fig. 1 to Fig. 5, a new type of intelligent molded case circuit breaker with the function of zero-off and open-phase protection provided by this embodiment includes a switch base 1 and a switch cover 2, and the switch cover 2 is provided with a plurality of The operation hole 3 corresponding to the switch mechanism and the display hole 4 corresponding to the display part, the switch base 1 is divided into three areas, which are respectively the high voltage area 21 connected to the main circuit, the installation of zero-sequence current transformer and The current signal acquisition installation area 22 of the current transformer and the weak voltage installation area 23 for voltage signal acquisition are installed. In this embodiment, the weak voltage installation area 23 is located on the right side of the strong voltage area 21 and the current signal acquisition installation area 22, so The high voltage area 21 is installed with a contact system, an arc extinguishing system, connecting terminals, a switch mechanism, and a three-phase main circuit current transformer and a zero-sequence current transformer connected to the main circuit. The current signal acquisition installation area 22 The top of the weak voltage installation area 23 for voltage signal collection is provided with a controller mounting seat 5, and a modular intelligent control system and a zero-off phase-opening protection circuit are arranged in the controller mounting seat 5, and the intelligent control system and The zero-off and open-phase protection circuit includes a signal acquisition circuit 6, an open-zero-phase-open analysis and comparison circuit 7 for analyzing the signal of the signal acquisition circuit 6, a display screen 8 connected to the zero-off-phase analysis and comparison circuit 7, and a The tripping drive circuit 9 connected to the phase analysis and comparison circuit 7, the fault alarm circuit 10 connected to the zero-phase-opening analysis and comparison circuit 7 and the communication circuit 11 connected to the zero-phase-opening analysis and comparison circuit 7 also include the above-mentioned various circuits The power supply circuit 12 for supplying power, the voltage signal detection circuit 13 of the main circuit and the current transformer and the zero-sequence current transformer detection circuit 14 for detecting the current signal, the specific circuit structure of the zero-phase failure analysis and comparison circuit 7 can be With reference to the Chinese invention patent No. 201510064022.9 filed by the applicant in 2015, the zero-phase-break analysis and comparison circuit 7 is added to include a 16-bit CPU processor, an A/D processing module, an output module, a display input module and Fault information storage module, the input module includes a setting data input circuit 17 for setting system operating parameters with keys and keys, and a date clock circuit 18 for providing running time and time parameters of fault occurrence, and the power supply circuit 12 Including self power supply circuit 15 and auxiliary power supply 16, described self power supply 15 is obtained after being collected by three-phase main circuit current transformer and processed in parallel type voltage stabilizing circuit, and described auxiliary power supply 16 is connected with main circuit through wire, through transformer and It is obtained after three-phase rectification and voltage stabilization. A tripper 19 for disconnecting the main circuit of the circuit breaker is installed at one corner of the mounting base 5, and the push rod of the tripper 19 realizes tripping by pushing the drawbar on the switch mechanism, and the switch passes through the switch mechanism when the switch is buckled again. The push rod on the top pushes the push rod of the tripper to realize energy storage. The tripper 19 is connected to the tripping drive circuit 9 through wires. When assembling, the tripper 19 is first fixed on the mounting base 5 by screws, and then The entire installation seat 5 is fixed on the switch base 1 by bolts, and the assembly is simple and quick.

As a preferred embodiment, the signal acquisition circuit 6, the zero-zero phase-opening analysis and comparison circuit 7, the display screen 8, the tripping drive circuit 9, the fault alarm circuit 10 and the communication circuit 11 are all installed in the mounting seat 5 through a circuit board , the periphery of the mounting seat 5 is provided with a plurality of gaps through which wires can pass.

The above descriptions are only the preferred implementation modes of the present utility model, as long as the technical solutions that achieve the purpose of the utility model by basically the same means all fall within the scope of protection of the utility model.

Claims (5)

1. a kind of novel intelligent breaker of plastic casing with default-phase protection function off zero, including switch base（1）And switch cover（2）, It is characterized in that：The switch base（1）Inside it is divided into three pieces of regions, the forceful electric power intermediate pressure section being respectively connected with main circuit（21）、 The current signal collection installation region of zero sequence current mutual inductor summation current transformer is installed（22）, voltage signal acquisition light current pressure Installation region（23）, the forceful electric power intermediate pressure section（21）Inside be provided with contact system, arc quenching system, binding post, switching mechanism and Connect three-phase main circuit current transformer on the main circuit and zero sequence current mutual inductor；The current signal gathers installation region （22）With light current installation region（23）Top be provided with controller mounting seat（5）, the controller mounting seat（5）Inside it is provided with module The intelligence control system of change and open-phase protection circuit off zero, the intelligence control system and open-phase protection circuit off zero include signal Acquisition Circuit（6）, to signal acquisition circuit（6）The phase shortage com-parison and analysis circuit off zero that is analyzed of signal（7）Lack with off zero Facies analyses comparison circuit（7）The display screen of connection（8）With phase shortage com-parison and analysis circuit off zero（7）The dropout drive circuit of connection （9）With phase shortage com-parison and analysis circuit off zero（7）The failure alarm circuit of connection（10）And with phase shortage com-parison and analysis circuit off zero （7）The telecommunication circuit of connection（11）, also include the power supply circuits being powered for above-mentioned each circuit（12）, the signals collecting Circuit（6）Including the voltage signal detection circuit of detection main circuit（13）With the current transformer and zero sequence electricity of sensed current signal Current transformer detects circuit（14）, the voltage signal detection circuit of main circuit（13）Acquisition process is isolated by voltage transformer, The power supply circuits（12）Including power itself circuit（15）And accessory power supply（16）, the power itself power supply（15）By three Phase main circuit current transformer gathers the gained to shunt regulating circuit process, the accessory power supply（16）By wire and master Circuit connects, the gained Jing after transformator and three phase rectifier voltage stabilizing are processed.

2. a kind of novel intelligent breaker of plastic casing with default-phase protection function off zero according to claim 1, its feature exists In：The signal acquisition circuit（6）, phase shortage com-parison and analysis circuit off zero（7）, display screen（8）, dropout drive circuit（9）, failure Warning circuit（10）And telecommunication circuit（11）Controller mounting seat is arranged on by circuit board（5）It is interior.

3. a kind of novel intelligent breaker of plastic casing with default-phase protection function off zero according to claim 1, its feature exists In：The controller mounting seat（5）One jiao be provided with make chopper disconnect main circuit electrical apparatus release（19）, the electrical apparatus release （19）Push rod realize threading off by the draw bar in pull switch mechanism, switch is pushed away when detaining again by the push rod on switching mechanism The push rod of dynamic electrical apparatus release realizes energy storage；Electrical apparatus release（19）By wire and dropout drive circuit（9）Connection.

4. a kind of novel intelligent breaker of plastic casing with default-phase protection function off zero according to claim 1, its feature exists In：The phase shortage com-parison and analysis circuit off zero（7）Including 16 bit CPU processors, A/D processing modules, output module, input module With fault message preserving module.

5. a kind of novel intelligent breaker of plastic casing with default-phase protection function off zero according to claim 4, its feature exists In：The input module includes the setting data input circuit with button and cipher key setting system running parameter（17）With for carrying The date clock circuit of the time parameter occurred for run time and failure（18）.